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SRI/USEPA-GHG-VR-27 September 2003 Munters air-handling unit was configured to be capable of using recovered heat when it is available or reverting back to the conventional natural gas-fired burners otherwise. Figure 1-3. Waldbaums Supermarket in Hauppauge, NY 1.3.1. Integration of CHP System with Facility Operations The facility electric load remains above the 60 kW microturbine generating capacity at all times and the unit normally operates "base-loaded" at full generating capacity. The unit is designed to shut down during power outages. The local utility currently does not require any interconnect protections other than those integrated into the Capstone 60 system. The heat demands of the facility will vary on a daily and seasonal basis and, although well-matched on the average to the heat generated and recoverable from the unit, will not generally represent a constant load or use the maximum available heat from the microturbine. The specific design of the CHP system in this application is unique in using two different heat-recovery pathways to optimize overall annual heat use at the facility. The single large 20,000-cfm central air handler for the facility (the Munters unit) makes it easier to use waste heat from the turbine to meet the space-heating loads. The space-heating loads are expected to be significant in this application due to the year-round space cooling load imposed by the refrigerated display cases. The need for heat to provide desiccant regeneration also adds significant heating loads in the summer. PG fluid from the Capstone Unifin heat-recovery unit provides heat to two hot coils that have been added to the Munters air-handling unit: (1) a PG coil in the supply air stream that provides space heating in the winter, and (2) a PG coil that preheats the air entering the direct-fire burner that regenerates the desiccant wheel. This arrangement with the Unifin heat exchanger was selected because it provides the greatest amount of year-round heat recovery which is required because of the large space-heating loads common to this climate (Note: An alternate configuration was also considered that would have used turbine exhaust directly for desiccant regeneration, but it was not implemented because it precluded the use of heat recovery for space heating.) The Unifin heat exchanger recovers heat from the microturbine exhaust that is used by the Munters unit to provide either space heating or desiccant regeneration. The PG fluid 1-6PDF Image | Environmental Technology Verification Report
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